fix: correctly shutdown QTimers

src/recorder.py

@@ -25,8 +25,7 @@ class RecorderClient(QObject):
         self.port: int = port
         self.socket: socket.socket = socket.socket(
             socket.AF_INET, socket.SOCK_STREAM)
-        self.timer: QTimer = QTimer(self)
-        self.timer.timeout.connect(self.poll_socket)
+        self.timer: Optional[QTimer] = None
         self.connected: bool = False
 
     @pyqtSlot()
@@ -34,6 +33,8 @@ class RecorderClient(QObject):
         self.socket.connect((self.host, self.port))
         self.socket.setblocking(False)
         self.connected = True
+        self.timer = QTimer(self)
+        self.timer.timeout.connect(self.poll_socket)
         self.timer.start(50)
         print("Connected to server")
 
@@ -84,7 +85,9 @@ class RecorderClient(QObject):
     @pyqtSlot()
     def shutdown(self):
         print("Shutting down client")
-        self.timer.stop()
+        if self.timer is not None:
+            self.timer.stop()
+            self.timer = None
         self.connected = False
         self.socket.close()